US Bridges

S.H. 20 over Grand River

Fair

Mayes County, Oklahoma · 1.0 MI W JCT SH 82 · Structure no. 158690000000000

Built
1963
62 years old, rebuilt 1999
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
1,200 ft
12 main spans
Daily traffic
6,300
2022 count
Owner
State
State Highway Agency

About this bridge

S.H. 20 over Grand River is a prestressed concrete stringer/multi-beam or girder carrying S.H. 20 over Grand River in Mayes County, Oklahoma. It was built in 1963 and reconstructed in 1999, so it is 62 years old, older than the Oklahoma average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 6,300 vehicles a day, roughly 16% of them trucks, projected to reach 10,080 by 2042. The structure is 1,200 ft (365.8 m) long and 66 ft wide. If it were closed, the detour would be 26.7 mi (43 km).

Location

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CarriesS.H. 20
CrossesGrand River
Location1.0 MI W JCT SH 82
RouteState Highway 20
CountyMayes County
StateOklahoma
Coordinates36.29432, -95.1658
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating110.1 US tons
Inventory rating58 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans12
Design loadHS 20
Structure length1,200 ft (365.8 m)
Longest span100 ft (30.5 m)
Deck width66 ft (20.1 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,300 (2022)
Projected traffic10,080 by 2042
Trucks16%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed26.7 mi (43 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$9.2 million
NavigationNo navigation control on waterway

Frequently asked questions

When was S.H. 20 over Grand River built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1999.

What condition is S.H. 20 over Grand River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in December 2023.

How much traffic does S.H. 20 over Grand River carry?

About 6,300 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is S.H. 20 over Grand River?

The structure is 1,200 ft (365.8 m) long with a longest span of 100 ft (30.5 m) and a deck 66 ft wide.

Who owns S.H. 20 over Grand River?

It is owned by the State Highway Agency.